Datasheet

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bq20z80-V102
SLUS681B – NOVEMBER 2005 – REVISED JANUARY 2007
CHANGE bq20z80 bq20z80-V101 COMMENTS
Corrected the length of SBS.ManufactureData( ) returned Only returns the appropriate data Correct data set made available to
SBS.ManufacturerData( ) command additional data not specified in the host
data sheet.
Changed DF:Charger Present default DF:Charger Present default was Default changed to 12000 mV. More realistic default for most
voltage to 12000 mV 16800 mV. applications
Corrected LED display lock-up fault LED display locks up if LEDs are ON LED display operates normally Correct operation of the LED display
when exiting sleep with LEDs on as the bq20z80 exits sleep mode. regardless of power state transitions. under all conditions
Added report of any inability to write If writing the data flash is not allowed The inability to write data flash in Improved calibration system
DFF as flash write error in calibration either due to a permanent failure or calibration mode is reported as a flash interaction
mode low voltage, then no indication is write error.
given when attempting to write data
flash in calibration mode.
Corrected issue of improperly clearing AFE faults were detected and the AFE faults are correctly handled, Improved system interaction when
AFE faults pack protected but the fault would be including the flags. faults occur
cleared up to three times at an
interval of 250 milliseconds before the
defined recovery requirements would
apply.
Modified code to save open-circuit OCV data was saved after a full reset OCV tables are only updated when IT Improved OCV data reliability under
voltage (OCV) data on IT enable only, which could have disturbed the OCV enabled, or the IT enable command is all system conditions
not a full reset measurements if the battery was not resent.
in a completely relaxed state.
Corrected range check for calibration In calibration mode, if the In calibration mode, if the Improved calibration system
of analog-to-digital converter (ADC) measurement ADC offset was out of measurement ADC offset is out of interaction
offset range, no error would be reported. range, an error is reported.
Implemented a validation time for There is a possibility of erroneous DOD0 measurement is not saved More reliable
DOD0 DOD0 measurement if charge or unless the battery remains in the SBS.FullChargeCapacity( ) and
discharge current occurs at the same relaxed state for a defined time after SBS.RemainingCapacity under all
time. the DOD0 measurement is made. system conditions
Implemented a bounds limit to a QMAX changes are not limited to QMAX changes are bounds limited to More reliable
QMAX change filter-bad readings. filter-bad readings. SBS.FullChargeCapacity( ) and
SBS.RemainingCapacity under all
system conditions
Implemented a double hit for dv/dt The dv/dt qualification for QMAX The dv/dt qualification for QMAX More reliable
detection for QMAX qualification update requires only one sample to update requires two samples to be SBS.FullChargeCapacity( ) and
be valid. valid. SBS.RemainingCapacity( ) under all
system conditions
Corrected parameter update issue If bq20z80 exits sleep during a SBS parameter updates operate Improved system interaction for sleep
caused by exiting sleep mode during current measurement, the SBS normally regardless of power state mode transitions
current measurement parameters do not update again until transitions.
the pack enters and exits sleep mode
again.
Implemented an option to leave When DF:Operation Cfg B [NR] is set, When DF:Operation Cfg B [NR, Improved system interaction options
charge FET on for a nonremovable then the CHG is turned off at entry to NRCHG] are set, then the CHG
pack in sleep mode, enabled by sleep mode. remains on at entry to sleep mode.
DF:Operation Cfg B [NRCHG].
Modified code such that if QMAX has Valid OCV is only discarded when all If QMAX has been updated, the same Enables QMAX measurement for full
not been updated, old valid OCV conditions for QMAX update are conditions for discarding an OCV charge or discharge for the first
readings are discarded when a new satisfied, but the accumulated error in reading are the same as for the QMAX update, even if initial OCV
valid OCV reading is detected and the the measured capacity exceeds 1% bq20z80. Otherwise, old OCV measurement is made when battery is
conditions for QMAX update do not (default value). readings are discarded and new OCV only partially charged.
exist. readings are used when the
conditions for a valid OCV reading
exist, but the conditions for QMAX
update do not exist.
Modified code such that if QMAX has The measured capacity must be For the first QMAX, the measured Improved QMAX data reliability for the
not been updated, then for QMAX greater than 20% (default value) or a capacity must be greater than 90% first update of QMAX
update to occur, the measured value as determined from the QMAX (default value) for a QMAX update to
capacity must be greater than or update filter constant for a QMAX occur. If QMAX update has occurred
equal to 90% (default value) of design update to occur. the conditions for measured capacity
capacity. are the same as for the bq20z80.
Default minimum passed charge for Internal flash value of Min Passed Internal flash value of Min Passed Improved QMAX data reliability under
QMAX update has been changed Charge is 20%. The default setting for Charge is 37%. This 37% is all system conditions.
from 20% to 37% the QMAX update filter constant of 64 consistent with the QMAX update
means actual Min Passed Charge for filter constant of 96.
QMAX update is 25%.
Default QMAX update filter constant Internal flash value of QMAX update Internal flash value of QMAX update Improved QMAX data reliability under
has been changed from 64 to 94. filter is 64. filter is 94. all system conditions.
QMAX values for nonexistent cells will DF:Qmax Cell 2..4 written with DF:Qmax Cell 2..4 are updated to = Ensure all QMAX values are
be updated to Design Capacity. random values if not used when DF:Design Capacity if not used when reasonable, even if not used
QMAX is updated QMAX is updated.
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